diff options
| -rw-r--r-- | drivers/char/hw_random/tpm-rng.c | 2 | ||||
| -rw-r--r-- | drivers/char/tpm/tpm-chip.c | 24 | ||||
| -rw-r--r-- | drivers/char/tpm/tpm-interface.c | 135 | ||||
| -rw-r--r-- | drivers/char/tpm/tpm.h | 2 | ||||
| -rw-r--r-- | include/linux/tpm.h | 38 | ||||
| -rw-r--r-- | security/integrity/ima/ima_crypto.c | 2 | ||||
| -rw-r--r-- | security/integrity/ima/ima_init.c | 2 | ||||
| -rw-r--r-- | security/integrity/ima/ima_queue.c | 2 | ||||
| -rw-r--r-- | security/keys/trusted.c | 35 |
9 files changed, 126 insertions, 116 deletions
diff --git a/drivers/char/hw_random/tpm-rng.c b/drivers/char/hw_random/tpm-rng.c index d6d448266f07..c5e363825af0 100644 --- a/drivers/char/hw_random/tpm-rng.c +++ b/drivers/char/hw_random/tpm-rng.c @@ -25,7 +25,7 @@ static int tpm_rng_read(struct hwrng *rng, void *data, size_t max, bool wait) { - return tpm_get_random(TPM_ANY_NUM, data, max); + return tpm_get_random(NULL, data, max); } static struct hwrng tpm_rng = { diff --git a/drivers/char/tpm/tpm-chip.c b/drivers/char/tpm/tpm-chip.c index a114e8f7fb90..bab9c14e040c 100644 --- a/drivers/char/tpm/tpm-chip.c +++ b/drivers/char/tpm/tpm-chip.c @@ -81,21 +81,26 @@ void tpm_put_ops(struct tpm_chip *chip) EXPORT_SYMBOL_GPL(tpm_put_ops); /** - * tpm_chip_find_get() - return tpm_chip for a given chip number - * @chip_num: id to find + * tpm_chip_find_get() - find and reserve a TPM chip + * @chip: a &struct tpm_chip instance, %NULL for the default chip * - * The return'd chip has been tpm_try_get_ops'd and must be released via - * tpm_put_ops + * Finds a TPM chip and reserves its class device and operations. The chip must + * be released with tpm_chip_put_ops() after use. + * + * Return: + * A reserved &struct tpm_chip instance. + * %NULL if a chip is not found. + * %NULL if the chip is not available. */ -struct tpm_chip *tpm_chip_find_get(int chip_num) +struct tpm_chip *tpm_chip_find_get(struct tpm_chip *chip) { - struct tpm_chip *chip, *res = NULL; + struct tpm_chip *res = NULL; + int chip_num = 0; int chip_prev; mutex_lock(&idr_lock); - if (chip_num == TPM_ANY_NUM) { - chip_num = 0; + if (!chip) { do { chip_prev = chip_num; chip = idr_get_next(&dev_nums_idr, &chip_num); @@ -105,8 +110,7 @@ struct tpm_chip *tpm_chip_find_get(int chip_num) } } while (chip_prev != chip_num); } else { - chip = idr_find(&dev_nums_idr, chip_num); - if (chip && !tpm_try_get_ops(chip)) + if (!tpm_try_get_ops(chip)) res = chip; } diff --git a/drivers/char/tpm/tpm-interface.c b/drivers/char/tpm/tpm-interface.c index ebe0a1d36d8c..19f820f775b5 100644 --- a/drivers/char/tpm/tpm-interface.c +++ b/drivers/char/tpm/tpm-interface.c @@ -809,19 +809,20 @@ int tpm_pcr_read_dev(struct tpm_chip *chip, int pcr_idx, u8 *res_buf) } /** - * tpm_is_tpm2 - is the chip a TPM2 chip? - * @chip_num: tpm idx # or ANY + * tpm_is_tpm2 - do we a have a TPM2 chip? + * @chip: a &struct tpm_chip instance, %NULL for the default chip * - * Returns < 0 on error, and 1 or 0 on success depending whether the chip - * is a TPM2 chip. + * Return: + * 1 if we have a TPM2 chip. + * 0 if we don't have a TPM2 chip. + * A negative number for system errors (errno). */ -int tpm_is_tpm2(u32 chip_num) +int tpm_is_tpm2(struct tpm_chip *chip) { - struct tpm_chip *chip; int rc; - chip = tpm_chip_find_get(chip_num); - if (chip == NULL) + chip = tpm_chip_find_get(chip); + if (!chip) return -ENODEV; rc = (chip->flags & TPM_CHIP_FLAG_TPM2) != 0; @@ -833,23 +834,19 @@ int tpm_is_tpm2(u32 chip_num) EXPORT_SYMBOL_GPL(tpm_is_tpm2); /** - * tpm_pcr_read - read a pcr value - * @chip_num: tpm idx # or ANY - * @pcr_idx: pcr idx to retrieve - * @res_buf: TPM_PCR value - * size of res_buf is 20 bytes (or NULL if you don't care) + * tpm_pcr_read - read a PCR value from SHA1 bank + * @chip: a &struct tpm_chip instance, %NULL for the default chip + * @pcr_idx: the PCR to be retrieved + * @res_buf: the value of the PCR * - * The TPM driver should be built-in, but for whatever reason it - * isn't, protect against the chip disappearing, by incrementing - * the module usage count. + * Return: same as with tpm_transmit_cmd() */ -int tpm_pcr_read(u32 chip_num, int pcr_idx, u8 *res_buf) +int tpm_pcr_read(struct tpm_chip *chip, int pcr_idx, u8 *res_buf) { - struct tpm_chip *chip; int rc; - chip = tpm_chip_find_get(chip_num); - if (chip == NULL) + chip = tpm_chip_find_get(chip); + if (!chip) return -ENODEV; if (chip->flags & TPM_CHIP_FLAG_TPM2) rc = tpm2_pcr_read(chip, pcr_idx, res_buf); @@ -889,25 +886,26 @@ static int tpm1_pcr_extend(struct tpm_chip *chip, int pcr_idx, const u8 *hash, } /** - * tpm_pcr_extend - extend pcr value with hash - * @chip_num: tpm idx # or AN& - * @pcr_idx: pcr idx to extend - * @hash: hash value used to extend pcr value + * tpm_pcr_extend - extend a PCR value in SHA1 bank. + * @chip: a &struct tpm_chip instance, %NULL for the default chip + * @pcr_idx: the PCR to be retrieved + * @hash: the hash value used to extend the PCR value * - * The TPM driver should be built-in, but for whatever reason it - * isn't, protect against the chip disappearing, by incrementing - * the module usage count. + * Note: with TPM 2.0 extends also those banks with a known digest size to the + * cryto subsystem in order to prevent malicious use of those PCR banks. In the + * future we should dynamically determine digest sizes. + * + * Return: same as with tpm_transmit_cmd() */ -int tpm_pcr_extend(u32 chip_num, int pcr_idx, const u8 *hash) +int tpm_pcr_extend(struct tpm_chip *chip, int pcr_idx, const u8 *hash) { int rc; - struct tpm_chip *chip; struct tpm2_digest digest_list[ARRAY_SIZE(chip->active_banks)]; u32 count = 0; int i; - chip = tpm_chip_find_get(chip_num); - if (chip == NULL) + chip = tpm_chip_find_get(chip); + if (!chip) return -ENODEV; if (chip->flags & TPM_CHIP_FLAG_TPM2) { @@ -1019,17 +1017,24 @@ out: return rc; } -int tpm_send(u32 chip_num, void *cmd, size_t buflen) +/** + * tpm_send - send a TPM command + * @chip: a &struct tpm_chip instance, %NULL for the default chip + * @cmd: a TPM command buffer + * @buflen: the length of the TPM command buffer + * + * Return: same as with tpm_transmit_cmd() + */ +int tpm_send(struct tpm_chip *chip, void *cmd, size_t buflen) { - struct tpm_chip *chip; int rc; - chip = tpm_chip_find_get(chip_num); - if (chip == NULL) + chip = tpm_chip_find_get(chip); + if (!chip) return -ENODEV; rc = tpm_transmit_cmd(chip, NULL, cmd, buflen, 0, 0, - "attempting tpm_cmd"); + "attempting to a send a command"); tpm_put_ops(chip); return rc; } @@ -1127,16 +1132,15 @@ static const struct tpm_input_header tpm_getrandom_header = { }; /** - * tpm_get_random() - Get random bytes from the tpm's RNG - * @chip_num: A specific chip number for the request or TPM_ANY_NUM - * @out: destination buffer for the random bytes - * @max: the max number of bytes to write to @out + * tpm_get_random() - get random bytes from the TPM's RNG + * @chip: a &struct tpm_chip instance, %NULL for the default chip + * @out: destination buffer for the random bytes + * @max: the max number of bytes to write to @out * - * Returns < 0 on error and the number of bytes read on success + * Return: same as with tpm_transmit_cmd() */ -int tpm_get_random(u32 chip_num, u8 *out, size_t max) +int tpm_get_random(struct tpm_chip *chip, u8 *out, size_t max) { - struct tpm_chip *chip; struct tpm_cmd_t tpm_cmd; u32 recd, num_bytes = min_t(u32, max, TPM_MAX_RNG_DATA), rlength; int err, total = 0, retries = 5; @@ -1145,8 +1149,8 @@ int tpm_get_random(u32 chip_num, u8 *out, size_t max) if (!out || !num_bytes || max > TPM_MAX_RNG_DATA) return -EINVAL; - chip = tpm_chip_find_get(chip_num); - if (chip == NULL) + chip = tpm_chip_find_get(chip); + if (!chip) return -ENODEV; if (chip->flags & TPM_CHIP_FLAG_TPM2) { @@ -1188,22 +1192,23 @@ int tpm_get_random(u32 chip_num, u8 *out, size_t max) EXPORT_SYMBOL_GPL(tpm_get_random); /** - * tpm_seal_trusted() - seal a trusted key - * @chip_num: A specific chip number for the request or TPM_ANY_NUM - * @options: authentication values and other options - * @payload: the key data in clear and encrypted form + * tpm_seal_trusted() - seal a trusted key payload + * @chip: a &struct tpm_chip instance, %NULL for the default chip + * @options: authentication values and other options + * @payload: the key data in clear and encrypted form + * + * Note: only TPM 2.0 chip are supported. TPM 1.x implementation is located in + * the keyring subsystem. * - * Returns < 0 on error and 0 on success. At the moment, only TPM 2.0 chips - * are supported. + * Return: same as with tpm_transmit_cmd() */ -int tpm_seal_trusted(u32 chip_num, struct trusted_key_payload *payload, +int tpm_seal_trusted(struct tpm_chip *chip, struct trusted_key_payload *payload, struct trusted_key_options *options) { - struct tpm_chip *chip; int rc; - chip = tpm_chip_find_get(chip_num); - if (chip == NULL || !(chip->flags & TPM_CHIP_FLAG_TPM2)) + chip = tpm_chip_find_get(chip); + if (!chip || !(chip->flags & TPM_CHIP_FLAG_TPM2)) return -ENODEV; rc = tpm2_seal_trusted(chip, payload, options); @@ -1215,21 +1220,23 @@ EXPORT_SYMBOL_GPL(tpm_seal_trusted); /** * tpm_unseal_trusted() - unseal a trusted key - * @chip_num: A specific chip number for the request or TPM_ANY_NUM - * @options: authentication values and other options - * @payload: the key data in clear and encrypted form + * @chip: a &struct tpm_chip instance, %NULL for the default chip + * @options: authentication values and other options + * @payload: the key data in clear and encrypted form + * + * Note: only TPM 2.0 chip are supported. TPM 1.x implementation is located in + * the keyring subsystem. * - * Returns < 0 on error and 0 on success. At the moment, only TPM 2.0 chips - * are supported. + * Return: same as with tpm_transmit_cmd() */ -int tpm_unseal_trusted(u32 chip_num, struct trusted_key_payload *payload, +int tpm_unseal_trusted(struct tpm_chip *chip, + struct trusted_key_payload *payload, struct trusted_key_options *options) { - struct tpm_chip *chip; int rc; - chip = tpm_chip_find_get(chip_num); - if (chip == NULL || !(chip->flags & TPM_CHIP_FLAG_TPM2)) + chip = tpm_chip_find_get(chip); + if (!chip || !(chip->flags & TPM_CHIP_FLAG_TPM2)) return -ENODEV; rc = tpm2_unseal_trusted(chip, payload, options); diff --git a/drivers/char/tpm/tpm.h b/drivers/char/tpm/tpm.h index c1866cc02e30..6c189174c0d3 100644 --- a/drivers/char/tpm/tpm.h +++ b/drivers/char/tpm/tpm.h @@ -516,7 +516,7 @@ static inline void tpm_msleep(unsigned int delay_msec) delay_msec * 1000); }; -struct tpm_chip *tpm_chip_find_get(int chip_num); +struct tpm_chip *tpm_chip_find_get(struct tpm_chip *chip); __must_check int tpm_try_get_ops(struct tpm_chip *chip); void tpm_put_ops(struct tpm_chip *chip); diff --git a/include/linux/tpm.h b/include/linux/tpm.h index 5a090f5ab335..ddc9b88ff6d3 100644 --- a/include/linux/tpm.h +++ b/include/linux/tpm.h @@ -24,11 +24,6 @@ #define TPM_DIGEST_SIZE 20 /* Max TPM v1.2 PCR size */ -/* - * Chip num is this value or a valid tpm idx - */ -#define TPM_ANY_NUM 0xFFFF - struct tpm_chip; struct trusted_key_payload; struct trusted_key_options; @@ -54,42 +49,47 @@ struct tpm_class_ops { #if defined(CONFIG_TCG_TPM) || defined(CONFIG_TCG_TPM_MODULE) -extern int tpm_is_tpm2(u32 chip_num); -extern int tpm_pcr_read(u32 chip_num, int pcr_idx, u8 *res_buf); -extern int tpm_pcr_extend(u32 chip_num, int pcr_idx, const u8 *hash); -extern int tpm_send(u32 chip_num, void *cmd, size_t buflen); -extern int tpm_get_random(u32 chip_num, u8 *data, size_t max); -extern int tpm_seal_trusted(u32 chip_num, +extern int tpm_is_tpm2(struct tpm_chip *chip); +extern int tpm_pcr_read(struct tpm_chip *chip, int pcr_idx, u8 *res_buf); +extern int tpm_pcr_extend(struct tpm_chip *chip, int pcr_idx, const u8 *hash); +extern int tpm_send(struct tpm_chip *chip, void *cmd, size_t buflen); +extern int tpm_get_random(struct tpm_chip *chip, u8 *data, size_t max); +extern int tpm_seal_trusted(struct tpm_chip *chip, struct trusted_key_payload *payload, struct trusted_key_options *options); -extern int tpm_unseal_trusted(u32 chip_num, +extern int tpm_unseal_trusted(struct tpm_chip *chip, struct trusted_key_payload *payload, struct trusted_key_options *options); #else -static inline int tpm_is_tpm2(u32 chip_num) +static inline int tpm_is_tpm2(struct tpm_chip *chip) { return -ENODEV; } -static inline int tpm_pcr_read(u32 chip_num, int pcr_idx, u8 *res_buf) { +static inline int tpm_pcr_read(struct tpm_chip *chip, int pcr_idx, u8 *res_buf) +{ return -ENODEV; } -static inline int tpm_pcr_extend(u32 chip_num, int pcr_idx, const u8 *hash) { +static inline int tpm_pcr_extend(struct tpm_chip *chip, int pcr_idx, + const u8 *hash) +{ return -ENODEV; } -static inline int tpm_send(u32 chip_num, void *cmd, size_t buflen) { +static inline int tpm_send(struct tpm_chip *chip, void *cmd, size_t buflen) +{ return -ENODEV; } -static inline int tpm_get_random(u32 chip_num, u8 *data, size_t max) { +static inline int tpm_get_random(struct tpm_chip *chip, u8 *data, size_t max) +{ return -ENODEV; } -static inline int tpm_seal_trusted(u32 chip_num, +static inline int tpm_seal_trusted(struct tpm_chip *chip, struct trusted_key_payload *payload, struct trusted_key_options *options) { return -ENODEV; } -static inline int tpm_unseal_trusted(u32 chip_num, +static inline int tpm_unseal_trusted(struct tpm_chip *chip, struct trusted_key_payload *payload, struct trusted_key_options *options) { diff --git a/security/integrity/ima/ima_crypto.c b/security/integrity/ima/ima_crypto.c index 9057b163c378..205bc69361ea 100644 --- a/security/integrity/ima/ima_crypto.c +++ b/security/integrity/ima/ima_crypto.c @@ -632,7 +632,7 @@ static void __init ima_pcrread(int idx, u8 *pcr) if (!ima_used_chip) return; - if (tpm_pcr_read(TPM_ANY_NUM, idx, pcr) != 0) + if (tpm_pcr_read(NULL, idx, pcr) != 0) pr_err("Error Communicating to TPM chip\n"); } diff --git a/security/integrity/ima/ima_init.c b/security/integrity/ima/ima_init.c index 2967d497a665..29b72cd2502e 100644 --- a/security/integrity/ima/ima_init.c +++ b/security/integrity/ima/ima_init.c @@ -110,7 +110,7 @@ int __init ima_init(void) int rc; ima_used_chip = 0; - rc = tpm_pcr_read(TPM_ANY_NUM, 0, pcr_i); + rc = tpm_pcr_read(NULL, 0, pcr_i); if (rc == 0) ima_used_chip = 1; diff --git a/security/integrity/ima/ima_queue.c b/security/integrity/ima/ima_queue.c index a02a86d51102..418f35e38015 100644 --- a/security/integrity/ima/ima_queue.c +++ b/security/integrity/ima/ima_queue.c @@ -145,7 +145,7 @@ static int ima_pcr_extend(const u8 *hash, int pcr) if (!ima_used_chip) return result; - result = tpm_pcr_extend(TPM_ANY_NUM, pcr, hash); + result = tpm_pcr_extend(NULL, pcr, hash); if (result != 0) pr_err("Error Communicating to TPM chip, result: %d\n", result); return result; diff --git a/security/keys/trusted.c b/security/keys/trusted.c index 98aa89ff7bfd..423776682025 100644 --- a/security/keys/trusted.c +++ b/security/keys/trusted.c @@ -355,13 +355,12 @@ out: * For key specific tpm requests, we will generate and send our * own TPM command packets using the drivers send function. */ -static int trusted_tpm_send(const u32 chip_num, unsigned char *cmd, - size_t buflen) +static int trusted_tpm_send(unsigned char *cmd, size_t buflen) { int rc; dump_tpm_buf(cmd); - rc = tpm_send(chip_num, cmd, buflen); + rc = tpm_send(NULL, cmd, buflen); dump_tpm_buf(cmd); if (rc > 0) /* Can't return positive return codes values to keyctl */ @@ -382,10 +381,10 @@ static int pcrlock(const int pcrnum) if (!capable(CAP_SYS_ADMIN)) return -EPERM; - ret = tpm_get_random(TPM_ANY_NUM, hash, SHA1_DIGEST_SIZE); + ret = tpm_get_random(NULL, hash, SHA1_DIGEST_SIZE); if (ret != SHA1_DIGEST_SIZE) return ret; - return tpm_pcr_extend(TPM_ANY_NUM, pcrnum, hash) ? -EINVAL : 0; + return tpm_pcr_extend(NULL, pcrnum, hash) ? -EINVAL : 0; } /* @@ -398,7 +397,7 @@ static int osap(struct tpm_buf *tb, struct osapsess *s, unsigned char ononce[TPM_NONCE_SIZE]; int ret; - ret = tpm_get_random(TPM_ANY_NUM, ononce, TPM_NONCE_SIZE); + ret = tpm_get_random(NULL, ononce, TPM_NONCE_SIZE); if (ret != TPM_NONCE_SIZE) return ret; @@ -410,7 +409,7 @@ static int osap(struct tpm_buf *tb, struct osapsess *s, store32(tb, handle); storebytes(tb, ononce, TPM_NONCE_SIZE); - ret = trusted_tpm_send(TPM_ANY_NUM, tb->data, MAX_BUF_SIZE); + ret = trusted_tpm_send(tb->data, MAX_BUF_SIZE); if (ret < 0) return ret; @@ -434,7 +433,7 @@ static int oiap(struct tpm_buf *tb, uint32_t *handle, unsigned char *nonce) store16(tb, TPM_TAG_RQU_COMMAND); store32(tb, TPM_OIAP_SIZE); store32(tb, TPM_ORD_OIAP); - ret = trusted_tpm_send(TPM_ANY_NUM, tb->data, MAX_BUF_SIZE); + ret = trusted_tpm_send(tb->data, MAX_BUF_SIZE); if (ret < 0) return ret; @@ -493,7 +492,7 @@ static int tpm_seal(struct tpm_buf *tb, uint16_t keytype, if (ret < 0) goto out; - ret = tpm_get_random(TPM_ANY_NUM, td->nonceodd, TPM_NONCE_SIZE); + ret = tpm_get_random(NULL, td->nonceodd, TPM_NONCE_SIZE); if (ret != TPM_NONCE_SIZE) goto out; ordinal = htonl(TPM_ORD_SEAL); @@ -542,7 +541,7 @@ static int tpm_seal(struct tpm_buf *tb, uint16_t keytype, store8(tb, cont); storebytes(tb, td->pubauth, SHA1_DIGEST_SIZE); - ret = trusted_tpm_send(TPM_ANY_NUM, tb->data, MAX_BUF_SIZE); + ret = trusted_tpm_send(tb->data, MAX_BUF_SIZE); if (ret < 0) goto out; @@ -603,7 +602,7 @@ static int tpm_unseal(struct tpm_buf *tb, ordinal = htonl(TPM_ORD_UNSEAL); keyhndl = htonl(SRKHANDLE); - ret = tpm_get_random(TPM_ANY_NUM, nonceodd, TPM_NONCE_SIZE); + ret = tpm_get_random(NULL, nonceodd, TPM_NONCE_SIZE); if (ret != TPM_NONCE_SIZE) { pr_info("trusted_key: tpm_get_random failed (%d)\n", ret); return ret; @@ -635,7 +634,7 @@ static int tpm_unseal(struct tpm_buf *tb, store8(tb, cont); storebytes(tb, authdata2, SHA1_DIGEST_SIZE); - ret = trusted_tpm_send(TPM_ANY_NUM, tb->data, MAX_BUF_SIZE); + ret = trusted_tpm_send(tb->data, MAX_BUF_SIZE); if (ret < 0) { pr_info("trusted_key: authhmac failed (%d)\n", ret); return ret; @@ -748,7 +747,7 @@ static int getoptions(char *c, struct trusted_key_payload *pay, int i; int tpm2; - tpm2 = tpm_is_tpm2(TPM_ANY_NUM); + tpm2 = tpm_is_tpm2(NULL); if (tpm2 < 0) return tpm2; @@ -917,7 +916,7 @@ static struct trusted_key_options *trusted_options_alloc(void) struct trusted_key_options *options; int tpm2; - tpm2 = tpm_is_tpm2(TPM_ANY_NUM); + tpm2 = tpm_is_tpm2(NULL); if (tpm2 < 0) return NULL; @@ -967,7 +966,7 @@ static int trusted_instantiate(struct key *key, size_t key_len; int tpm2; - tpm2 = tpm_is_tpm2(TPM_ANY_NUM); + tpm2 = tpm_is_tpm2(NULL); if (tpm2 < 0) return tpm2; @@ -1008,7 +1007,7 @@ static int trusted_instantiate(struct key *key, switch (key_cmd) { case Opt_load: if (tpm2) - ret = tpm_unseal_trusted(TPM_ANY_NUM, payload, options); + ret = tpm_unseal_trusted(NULL, payload, options); else ret = key_unseal(payload, options); dump_payload(payload); @@ -1018,13 +1017,13 @@ static int trusted_instantiate(struct key *key, break; case Opt_new: key_len = payload->key_len; - ret = tpm_get_random(TPM_ANY_NUM, payload->key, key_len); + ret = tpm_get_random(NULL, payload->key, key_len); if (ret != key_len) { pr_info("trusted_key: key_create failed (%d)\n", ret); goto out; } if (tpm2) - ret = tpm_seal_trusted(TPM_ANY_NUM, payload, options); + ret = tpm_seal_trusted(NULL, payload, options); else ret = key_seal(payload, options); if (ret < 0) |